使用列表理解修改特定索引處的列表值

Question

所以我試圖將特定索引處的值更改為列表中的每個元素。

colors = [[f'#{f}10c2b']*3 for f in range(3)]
[colors[f//3][f%3][3]=f for f in range(9)]# Syntax is incorrect I am just making an example

我想要做的是使用f變量更改索引 3 處的每個元素的值

Answer 1

colors = [['#010c2b', '#010c2b', '#010c2b'], ['#110c2b', '#110c2b', '#110c2b'], ['#210c2b', '#210c2b', '#210c2b']] # your original list
f = "4" # the new value
index = 2  #the index of he item you want to replace
index1 = 0 #the index you are iterating on

newlist =[ [elem if index != count else f for count, elem in enumerate(list)] for list in colors]
print(newlist)

Output：

[['#010c2b', '#010c2b', '4'], ['#110c2b', '#110c2b', '4'], ['#210c2b', '#210c2b', '4']]